United States     Office of Air Quality      EPA-450/5-83-001e
Environmental Protection  Planning and Standards     August 1982
Agency        Research Triangle Park NC 27711
_
Benefit Analysis
of Alternative
Secondary
National Ambient
Air Quality
Standards
for Sulfur Dioxide
and Total
Suspended
Particulates

Volume V

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                                   FINAL ANALYSIS
                     BENEFITS ANALYSIS OF ALTERNATIVE  SECONDARY

                     NATIONAL AMBIENT AIR QUALITY STANDARDS  FOR

                  SULFUR DIOXIDE AND TOTAL SUSPENDED PARTICULATES



                                      VOLUME V
                             BENEFITS ANALYSIS PROGRAM
                              ECONOMIC ANALYSIS BRANCH
                       STRATEGIES AND AIR STANDARDS DIVISION
                    OFFICE OF AIR QUALITY PLANNING AND  STANDARDS

                        U-S-  ENVIRONMENTAL PROTECTION AGENCY

                               RESEARCH TRIANGLE PARK
                               NORTH CAROLINA  27711
U.S. Environment  Protection Agenc*j

Region v, L- >'
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U,S. Environmental Protection "Agency

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                    FINAL ANALYSIS
      BENEFITS ANALYSIS OF ALTERNATIVE SECONDARY
      NATIONAL AMBIENT AIR QUALITY STANDARDS FOR
   SULFUR DIOXIDE AND TOTAL SUSPENDED PARTICULATES
Ernest H. Manuel, Jr.
Robert L. Horst, Jr.
Kathleen M. Brennan
                         By:
William N. Lanen
Marcus C. Duff
Judith K. Tapiero
               With the Assistance of:
Richard M. Adams
David S. Brookshire
Thomas D. Crocker
Ralph C. d'Arge
A. Myrick Freeman, III
Shelby D. Gerking
Edwin S. Mills
William D. Schulze
                    MATHTECH, Inc.
                    P.O. Box 2392
             Princeton, New Jersey  08540
            EPA Contract Number 68-02-3392
                   Project Officer:
                   Allen C. Basala
               Economic Analysis Branch
        Strategies and Air Standards Division
     Office of Air Quality Planning and Standards
         U.S.  Environmental Protection Agency
    Research Triangle Park, North Carolina  27711
                     August 1982

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                               PREFACE
     This report was prepared for the U.S. Environmental Protection
Agency by MATHTECH, Inc.  The report  is organized into  six volumes
containing a total  of 14 sections as  follows:
          Volume I
               Section  1:
               Section  2:
               Section  3:
          Volume II
               Section  4:
               Section  5:
               Section  6:

          Volume III

               Sect ion  7:
               Section  8:

          Volume IV

               Section  9:

          Volume V

               Section 10:
               Section 11:

          Volume VI

               Section 12:
               Section 13:
               Section 14:
Executive Summary
Theory, Methods and Organization
Air Quality and Meteorological Data
Household Sector
Residential Property Market
Labor Services Market
Manufacturing Sector
Electric Utility Sector
Agricultural Sector
Extrapolations
Bibliography
Summary of the Public Meeting
Analysis of Pollutant Correlations
Summary of Manufacturing Sector Review
     The analysis and conclusions presented  in  this report are  those
of the authors and should not be interpreted  as  necessarily reflecting
the official policies of the U.S.  Environmental  Protection Agency.

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                          ACKNOWLEDGMENTS
     This report and the underlying analyses profited  considerably
from the efforts of Allen Basala,  who served as EPA Project  Officer,
and V.  Kerry Smith,  who  served as a reviewer for EPA.  Allen  provided
the initiative  and  on-going  support to conduct an applied benefits
analysis.  Kerry's technical insights and suggestions are reflected in
nearly every section of  the report.

     James Bain and Tom  Walton of  EPA,  and  Jan Laarman  and Ray
Palmquist,  who served  as reviewers  for EPA,  also  contributed
substantially  to individual report  sections  through their advice and
comments during the course of the  project.  Also  providing helpful
comments and assistance  were  Don Gillette,  Fred Haynie, Neil Frank and
Larry Zaragosa,  all with EPA.

     Several other members of the Mathtech staff contributed to the
project during various  stages of the work.  They included Robert J.
Anderson, Jr., Neil Swan, John Keith, Donald Wise,  Yaw  Ansu,  Gary
Labovich, and  Janet  Stotsky.

     The production  of  the report was  ably managed  by Carol  Rossell,
whose patience remained  intact through countless drafts and deadlines.
Carol was assisted by Sally Webb, Gail  Gay, and Deborah Piantoni.

     Finally,   we extend  our appreciation  to the  many dozens  of
individuals,   too numerous to list here,  who provided  advice,
suggestions, and data during  the  course of  the project.
                                 111

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                               CONTENTS


10.   EXTRAPOLATIONS

          Introduction 	  10-1

          Household Sector Extrapolations 	  10-2

               Overview 	  10-4
               Data Development Procedures 	  10-5
               Estimated Household Sector Benefits 	  10-7

          Manufacturing Sector Extrapolations 	  10-13

               Overview 	  10-13
               Extrapolation Procedure 	  10-17
               Manufacturing Sector Estimated Benefits 	  10-21

          Electric Utility Sector Extrapolations 	  10-27

               Overview 	«	  10-27
               Other Types of Power Plants 	  10-27
               Transmission and Distribution Systems 	  10-28

          Summary of Extrapolations 	  10-34

          References 	  10-38


11.   BIBLIOGRAPHY

          Part A:  Economic Theory and Data 	  11-1

          Part B:  Sources of Information on Pollution 	  11-15
                                   IV

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                                TABLES
Number                                                           Page

 10-1.    Coverage of Economic Activity in Each Sector  	  10-3

 10-2.    Household Sector Extrapolation for Current
          3-Hour Secondary S02 Standard 	  10-8

 10-3.    Household Sector Extrapolation for Alternative
          24-Hour Secondary S02 Standard 	  10-10

 10-4.    Household Sector Extrapolation for Current
          24-Hour Secondary TSP Standard 	  10-12

 10-5.    Industries Included in the Extrapolations 	  10-18

 10-6.    Manufacturing Sector Extrapolation for Current
          3-Hour Secondary S02 Standard 	  10-22

 10-7.    Manufacturing Sector Extrapolation for Alternative
          24-Hour Secondary S02 Standard 	  10-23

 10-8.    Manufacturing Sector Extrapolation for Current
          24-Hour Secondary TSP Standard 	  10-24

 10-9.    Geographic Distribution of Extrapolated Benefits
          for the Manufacturing Sector 	  10-26

 10-10.   Estimated Benefits to Electric Utility
          Transmission and Distribution Systems from
          Attainment of the Alternative 24-Hour S02
          Secondary Standard 	  10-33

 10-11.   Estimated Benefits in Sectors Analyzed for
          Current S02 Secondary Standard 	  10-35

 10-12.   Estimated Benefits in Sectors Analyzed for
          Alternative S02 Secondary Standard 	  10-36

 10-13.   Estimated Benefits in Sectors Analyzed for
          Current TSP Secondary Standard 	  10-37

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  SECTION 10



EXTRAPOLATIONS

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                             SECTION 10

                          EXTRAPOLATIONS*



INTRODUCTION

     The  previous  sections of this report have  estimated  the economic

benefits  of alternative secondary ambient air  quality  standards for

the household,  manufacturing,  electric utility,  and  agricultural

sectors.   However,  the estimates  obtained in each of  the  sectors

represent only a partial accounting  of  total benefits.   In each  of the

analyses,  data limitations or methodological considerations prevented

the enumeration  of a  complete set of national benefits.   For example,

in the household sector, the geographic coverage was  limited to 24

SMSAs and economic data were available for only  about 40 percent of

current consumption  expenditures.   Similarly, the analysis in the

manufacturing  sector covered only six  industries,  with these

industries  accounting  for about  8 percent of the  value added in that

sector.  In order  to  broaden the scope of the analysis, this section

provides  a  limited extrapolation of  the results of the basic analysis.
* Sections 1 and 2  of  the report  should  be read before tnis section.
  An understanding  of  Sections 3,  4,  7 and  8  would also  be  desirable,
  but it  is  not as  essential.
                                 10-1

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     Table  10-1 summarizes the basic scope  of  the study.  Note  that  in



addition to limited coverage of the sectors analyzed  in this study,



there are several sectors which were not covered at all.  Furthermore,



consideration  of benefit  types  is  restricted  to  vegetation and



materials  damage and soiling.  Since  the extrapolations reported  in



this section are limited to  extended  coverage of  the  sectors and



benefit types  analyzed in the  basic study,  the benefits reported




represent  conservative estimates of the  benefits  associated with



attainment  of the secondary ambient air  quality standards.








     The remaining subsections  review  the extrapolation procedures and



report extrapolated benefits  for  the household, manufacturing, and



electric utility sectors.   For  reasons given  in  Section  9,   no



extrapolations were attempted in the agricultural sector.








HOUSEHOLD SECTOR EXTRAPOLATIONS








     The  basic analysis in the household sector is  limited to  24



SMSAs,  with these SMSAs  accounting  for approximately 30 percent of the



total U.S.  population in 1976.   This subsection estimates  the benefits



that would  be realized by other areas  of the country,  given  attainment



of  the secondary standards  for TSP and  SO«
                                 10-2

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      TABLE 10-1.   COVERAGE  OF ECONOMIC ACTIVITY IN EACH SECTOR

Final demand sector

Households*
Government
Other
Totals

— . _3 • ,
rrooucing sector



Percent of
final demand

63.5
20.5
16.0
100.0

T"} v** *- *-*-C
Fercent or
GNP

Percent
Basic
analysis
17
0
_£
11**
Percent


Basic
analysis
coverage
Basic plus
extrapolation
45-55
0
0
29-35**
coverage


Basic plus
extrapolation
  Agriculture,  forestry
    and fisheries

  Mining and
    construction

  Manufacturing

  Transportation,
    communication and
    utilities

  Commercial and
    services

  Government and other

  Totals
 3.1


 7.1


23.9

 9.0



43.6
2-15


 0


4-8

8-11
 2-15


  0


25-30

15-20
 * Goods and services consumed by  individuals and certain nonprofit
   institutions.  Includes rental of dwellings but not purchases of
   dwellings.   The latter are included with "other".
**
   Weighted average  coverage.
Source:   Estimates  of final  demand  and GNP  shares  are from U.S.
         Department  of Commerce,  Bureau of Economic Analysis.   Survey
         of  Current  Business.  July 1979.  Tables 1.1 and 6.1.
                                  10-3

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Overview



     In the  basic  household sector analysis  (see Section 4),  benefits

are calculated in a two-stage procedure. In the  first stage, price

data  for  marketed  goods  such as  laundry   and  cleaning supplies,

together with data on  air quality,  climate,   and  household

demographics,  are used to calculate the implicit prices  for "final"

goods and services  such  as  "household operations."  In  the second

stage, the implicit  prices are used to  calculate the allocation of

household  expenditures among  the various final goods  and services.  In

this formulation,  the effect of an air quality  improvement is to

reduce some of the implicit prices and therefore induce a reallocation

of household expenditures.  Benefits are then  estimated by  calculating

the compensating  variation  (CV)  associated with  the  expenditure

reallocation.*



     In extrapolating beyond the original 24  SMSAs, the same procedure

as described  above  is  used.   However,   some of  the  required

demographic,  climate,  and market price data  are not  available for the

counties outside of the original SMSAs.  Thus, approximate  data are

used  instead,  together  with actual  air  quality  data.   For the

demographic and climate data, regional  averages  are used.   For the
* The compensating variation  (CV) is a measure of the compensation
  required  such that the consumer is  indifferent between the original
  price set and the new price set.
                                 10-4

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price data,  two  alternative approaches are used since benefits are



especially  sensitive to price:   regional average  prices,  and the



highest and  lowest price  sets  from among the original SMSAs (where



high  and  low are  measured in terms of effect  on  benefits).   The



specific data development procedures are  described more fully  below.








     Note  that this extrapolation procedure  assumes  that  the  implicit



price and  expenditure  models developed in the basic analysis  are also



appropriate  for  other parts  of  the country.   This does not  seem



unreasonable since the original 24  SMSAs  were quite varied.  Note



also,  however,  that  by using  the models  developed in  the  basic



analysis,  the scope of the extrapolation  is  limited  to  those  benefit



types included in that analysis.   Consequently, since such benefits as



visibility improvement and  ecosystem  protection were neglected there,



the  extrapolated  benefits in  the  household  sector  continue  to



represent conservative estimates  of the benefits  associated with



attainment of the secondary standards.







Data Development  Procedures







     The geographic  extrapolations reported here are done  on a  county-



by-county basis.  Counties included within the boundaries of the



original  24  SMSAs  were excluded  from the extrapolation procedures.



The specific  assumptions made in performing the extrapolation  include:
                                 10-5

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Certain data  are  assigned to counties based on  the
region in  which  the county is located.  In particular,
the following  steps were taken:

—  The country is divided  into  two major areas —
    Northeast  plus North Central and South plus West.

—  Averages by region are  computed from the SMSA-
    specific data for the following items:

     a)  30-year average temperature.

     b)  family size

     c)  average annual percent change in the  all-item
        consumer price index.

     d)  average percent of total consumption expendi-
        tures in the SMSA data.

     e)  disaggregate  and aggregate  price  sets
        developed for the basic analysis.

Certain data are assigned to counties based on county-
or state-level data.  These data include:

—  Air quality data  obtained  from the SAROAD data
    base (1978 statistics)  on a site-by-site basis  and
    aggregated to the county-level  by the procedures
    described  in Section 3.

—  Baseline county population numbers obtained from
    the County and City  Data Book,  1977 (1).  These
    are 1975 statistics.   Conversions to household
    data are made  by dividing by the regional family
    size values.

—  Population  projections by county  developed by
    calculating  the  annual  percent  change   in
    population by county between 1970 and 1975.  These
    data are obtained from  the County and City Data
    Book,  1977 (1).  The annual changes are assumed to
    be maintained  at the same rate into  the future.

    State  income  projections  for 1985  and 1990
    (current  1972  dollars)  obtained  from   the
    Department of  Commerce News, December 9,  1980  (2).

—  The annual percent changes in income  implied by
    the data  described  above are computed  for each
    state. These  annual changes  are assumed to hold
    into the future.
                        10-6

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     •    Certain data  or assumptions are  pertinent to  all
          counties.  These include:

          —   The  parameters of  the  various demand equations
              estimated in Section 4.

          —   The  air  quality  scenario developed  for  the
              benefits calculations  remains the same as before.

          —   Benefits are calculated as discounted present
              values in 1980,  in 1980  dollars.  A social rate of
              discount of  10 percent and  an  infinite time
              horizon are assumed.
Estimated Household Sector Benefits



Given the extrapolation  scenario described above, household sector

benefits  were  calculated  on  a  county-by-county  basis  for each

pollutant and  then  aggregated to Census Divisions.



     Table 10-2  presents the benefits  obtained in the household  sector

for attainment of the current 3-hour  secondary  standard  for  S02.   As

described in Section 3,  it is not possible to calculate directly  the

incremental benefits  for the 3-hour standard  since there is no primary

standard defined for  the  same averaging time.  Consequently,  for each

county,  we have  calculated the  equivalent 24-hour concentration  level

that would be  expected to  occur when  the 3-hour standard is just met.

This 24-hour  concentration  level is then  used  as an "equivalent"

secondary standard and  comparisons  can  be made directly with  the

current  24-hour  second-high primary standard.
                                 10-7

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    TABLE 10-2.   HOUSEHOLD SECTOR EXTRAPOLATION FOR CURRENT 3-HOUR
                 SECONDARY S02 STANDARD* (discounted present
                 values  for 1580 in millions of 1980 dollars)**


          Census
         Division          Benefit estimates with average price  set


  1.  New England

  2.  Mid-Atlantic

  3.  East North  Central                      1.81

  4.  West North  Central

  5.  South Atlantic

  6.  East South  Central                      0.02

  7.  West South  Central

  8.  Mountain                               0.19

  9.  Pacific


  U.S. total                                 2.02
 * Current S02 secondary standard is 1,300 ug/m-3, based on a 3-hour
   averaging time.   Standard not to be exceeded  more than once per
   year.

** Discount rate  of  10 percent is assumed.

— Equals zero.
     As Table 10-2  shows,  the estimated benefits of the current 3-hour

SO- standard are small.  This  is  in part because only soiling  and

materials effects are captured by  the model.   It  also  occurs because

very few counties in the United  States are out  of  compliance  with  the

equivalent  secondary standard,  given that  the primary standard is
                                  10-8

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attained.  In fact, benefits for attainment of the secondary standard



are  predicted  to  be realized in only five  counties,  with  total



benefits of  $2.02 million dollars.







     In Section 3, it was noted that air pollution measures based on



longer  averaging times  were likely to be more  appropriate  for  the



types of damaging  effects included in our analysis.   Because of this,



benefits were analyzed for  an  alternative secondary  standard  for  SC>2



based on a  24-hour averaging  time.   For this alternative standard of



260 ug/m^ the SCU benefits are  as shown  in Table 10-3.







     The top part of  Table 10-3 reports  benefits only for counties  not



included in the original  analysis.   The  range of  estimates denoted by



low, average, and  high price sets  gives some idea of the sensitivity



of the results  to assumptions  concerning the  assignment  of  prices to



counties.








     The average price set  is  defined on a regional basis.   That  is,



from the original group of 24 SMSAs, average prices are calculated  for



all those SMSAs in the Northeast or North Central regions to obtain an



index of prices for all counties  located in  these  two regions.   A



similar average  is  calculated for counties in  the South and West.







     The low and high price  sets are obtained by finding the SMSAs,



from our group of 24, that yield the low and  high marginal valuations



of air quality improvements.  For  example, in .order to  identify  the
                                  10-9

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 TABLE 10-3.  HOUSEHOLD SECTOR  EXTRAPOLATION FOR ALTERNATIVE 24-HOUR
              SECONDARY S02  STANDARD*  (discounted present values
              for 1980 in millions of  1980 dollars)**
Census
Division
1. New England
2. Mid-Atlantic
3. East North Central
4. West North Central
5. South Atlantic
6. East South Central
7. West South Central
8 . Mountain
9. Pacific
Extrapolated U.S. total
24 SMSA total
Total U.S. benefits
Low price
set
6
24
64
1
43
21
—
19
—
178


Average price
set
6
26
69
1
41
20
—
18
—
181
920
1,101
High price
set
8
33
87
1
62
31
—
28
—
250


 * Alternate SO,- secondary standard is 260 ug/m^,  based  on a 24-hour
   averaging  time.   Standard not  to be exceeded more than once per
   year.

** Discount rate of  10  percent is assumed.

— Equals zero.




"high price set"  SMSA,  we  evaluate  the predicted level of benefits per

unit  change  in  air quality (TSP and  S02)  for  each  SMSA.   This

evaluation is  performed at a variety of air quality levels  in order to
                                  10-10

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account  for changes in the marginal valuations across concentration



levels.  When this  analysis is performed, New York City households  are



found to have the highest  per-unit valuation.  Thus,  the price  set  for



New York  City is  assigned  to  each  of  the counties   in  the



extrapolation, and  the  benefits calculations performed.  These  results



are  reported under the high  price set  column.  Similar steps are



carried out to identify the low price set SMSA.  In this case,  Atlanta



is found to be the  SMSA with the lowest marginal valuations.








     On a regional basis, the largest benefits are realized in the



eastern  part of the  country, with the East North  Central  Region



accounting for almost  40 percent of extrapolated U.S. benefits.







     The bottom part of Table  10-3  lists  the total benefits estimated



for the original SMSAs.  Because of the different types of  sensitivity



checks carried out  in  the  two  sets  of  benefits calculations, only  the



"most reasonable" values are reported  from  the analysis phase.  These



are listed  under the average  price set column,  and the estimate of



total U.S. benefits  for  SCu is recorded on the last line of the table.



The best  estimate of total household sector benefits (soiling and



materials benefits)  for attainment of  a  24-hour averaging  time



secondary standard  for  SO- is  approximately  $1.1 billion.







     Table 10-4 presents  extrapolations for TSP.  The low, average,



and high price sets  are as defined above.   Since  primary and secondary



air quality standards  for  TSP  exist with the same averaging time, no
                                 10-11

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   TABLE 10-4.  HOUSEHOLD SECTOR EXTRAPOLATION FOR CURRENT 24-HOUR
               SECONDARY TSP  STANDARD* (discounted present values
               for 1980 in millions of 1980 dollars)**
Census
Division
1. New England
2. Mid-Atlantic
3. East North Central
4. West North Central
5. South Atlantic
6. East South Central
7. West South Central
8. Mountain
9. Pacific
Extrapolated U.S. total
24 SMSA total
Total U.S. benefits
Low price
set
64
119
220
60
58
64
60
244
297
1,186


Average price
set
72
133
245
68
63
69
67
270
344
1,331
2,299
3,630
High price
set
86
160
294
80
73
79
77
308
392
1,549

— — — 	 ________
 * Current TSP secondary standard is 150 ug/m^,  based  on a  24-hour
   averaging time.  Standard not to be exceeded  more than once per
   year.

** Discount rate of 10 percent is assumed.
additional transformations were required to account for  alternate

averaging  times.



     The regional dispersion of TSP benefits is different from that

observed for SO^.  In this case, the largest benefits occur in the
                                10-12

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East North Central, Mountain, and Pacific  regions.   Note,  however,



that the other six  regions  realize nontrivial benefits.







     As with S02, the bottom part of Table 10-4 records the  benefits



calculated from  the original  24 SMSAs.   In this  case,   the  best



estimate of total household sector benefits  (soiling and materials



benefits)  for attainment of  a 24-hour  averaging  time secondary



standard for TSP is about $3.63  billion.








MANUFACTURING SECTOR EXTRAPOLATIONS







Overview








     The basic analysis  in  the manufacturing  sector (see  Section 7) is



limited to six 3-digit SIC industries  comprising  about 8.3 percent of



the value added in the manufacturing  sector.    The analysis is done on



a county-by-county basis  in each  industry.   The unavailability of air



quality data and economic data for those industries in many counties



of the U.S. further reduces the coverage  to about 3.6 percent (i.e.,



data sets were available for counties containing about one-half the



economic  value  in  the  six  industries).   The  possibilities  for



extrapolation of  the basic  analysis  thus included:  (1) extending the



geographic  coverage of the  original  six  industries  to other  areas of



the  country;  and   (2) extending coverage  to other manufacturing



industries.
                                 10-13

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Geographic  Extrapolation—



     It was decided  not  to  undertake the geographic  extrapolation for



two reasons.  First, although counties  containing  only half of the



economic value  (on average)  in  the six industries were included  in the



basic analysis, these counties  are the more industrialized  counties in



the U.S.  Since air pollution is likely to  be  more severe in these



counties, and less severe in the other counties, the probability of



identifying large additional benefits in  the other counties was  judged



to be small.







     Second, the basic  analysis already  included  all counties for



which economic data were available.  Thus, to extend the  geographic



coverage to other areas, the  analysis would have to be done at the



more aggregate SMSA (metropolitan area) level.  A  review of this



situation indicated  the  following:   (1)  single-county SMSAs would be



of no interest because  those for which economic data were available



were already included  in the basis analysis; and (2)  for  many  of the



multi-county SMSAs,  air quality data were not available for all  of the



member counties, and  thus air quality for the SMSA  was not well



defined.







     In view of  the two reasons above — the  expectation of  small



benefits, and the limitations of  the air  quality data — no geographic



extrapolation  for the original six  industries was undertaken.
                                 10-14

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Industry Extrapolation—



     The alternative possibility was to extrapolate the results for



the original six industries  to some  of  the other closely related



manufacturing industries.  For example, two of the industries included



in  the  basic analysis  were SIC  344  (fabricated structural  metal



products) and SIC 346 (metal forgings  and stampings).  Both of these



3-digit SIC  industries  are part of the broader 2-digit industry,  SIC



34  (fabricated metal products).  One  might  therefore take the view



that the air  pollution effects identified in the  two subindustries are



representative of the effects  likely to be present  in  the broader



industry group.







     The extrapolation to other  industries, of  course,  raises  two



questions.   First,  can  the effects  identified in  the subindustries be



viewed as representative  of  the  effects in the broader  industry group?



Second,  if  so, how .should  the extrapolation be carried out?   The first



question cannot be  answered  definitively without actually  conducting a



specific analysis of  the  other  subindustries  in  each group.   Clearly,



there are similarities  among the various  3-digit  industries within a



2-digit group.  The similarities can  include the use of common raw



materials,  similar processing  techniques, and  most importantly, the



production  of related end  products.   However, the  industries can also



be different  in important  ways,  and it  is the latter fact  which guided



the selection of  an extrapolation procedure.
                                 10-15

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     One possible  extrapolation  procedure  would be  to  apply the



estimated models for the six industries, developed  in  Section 7,  to



data for the corresponding  2-digit industries.  The models  in that



section are  designed to estimate the savings in production  cost (e.g.,



maintenance cost)  due  to an improvement in air quality.   However,



direct application  of the  models  was viewed as  unattractive  for two



reasons.   First,  it requires two  specific assumptions:   (1) that the



underlying  production technology is  the same  at  both  the 2-digit and



3-digit  levels;  and (2)  that  the effect of air  pollution  on that



technology  is similar at  both   the  2-digit  and  3-digit  levels.



Comparisons  in Section  7  between  the 3-digit SIC models developed  in



this study  and  the 2-digit SIC models developed  in another study



suggest that at least the first of  these assumptions may not always  be



valid.








     A second problem with  applying the  models directly is that the



models incorporate  specially developed price indexes for  raw materials



inputs used by the 3-digit  industries.   New price indexes would  be



required corresponding to  the different mix of input materials  used  by



the 2-digit  industries.







     In view of  the above,  a less  formal  extrapolation procedure was



adopted.   It basically involves answering  the following  question:   If



the benefits of  improved air quality at the 2-digit level were the



same as at  the 3-digit level  in terms of the percentage  savings  in



production  cost for a given change  in air  quality, how large would the
                                 10-16

-------
benefits be?   Note that this approach does not necessarily require

that the underlying production technologies  be  the  same — only that

air  quality benefits,  on  a  percentage  basis,  be  the same.   The

remainder  of  this subsection addresses the above question.  Three

features of the extrapolation are worth noting:
          Actual economic data on  each 2-digit  industry are
          used,  on  a  county-by-county basis.

          Actual air  quality data are used on a county-by-county
          basis.

          The sensitivity of the results to variations in the
          benefits observed within each 3-digit  industry are
          examined.
The extrapolations are carried  out for the 2-digit SIC  industries

listed in Table  10-5.



Extrapolation  Procedure



     In the basic analysis,  benefits  are calculated by estimating the

savings in production  costs  that  would  result  from attainment of the

secondary ambient air  quality  standards, as  compared to attainment of

the primary standards  only.  This  savings  (benefit) is calculated for

each industry  and county.   It  is  calculated  as  the discounted present

value (DPV) in 1980 dollars,  of  all future cost savings  due to the

secondary standards.
                                 10-17

-------
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10-18

-------
     The benefits calculated  in  the  basic  analysis are used in the

extrapolations  as follows.   First,  the following quantities  are

calculated  for each county included in the basic  analysis for each 3-

digit SIC:
     •    The  dollar benefits, per dollar of value added, per
          unit change in air quality.

     •    The  dollar benefits,  per dollar of  value  shipped, per
          unit change in air quality.
For convenience, the first quantity above will be denoted by

where  i  indexes  industries and  j  indexes  counties.   The  second

quantity will be denoted as BVS^u.  The above ratios are calculated

for each county where  there are non-zero benefits;  i.e., where air

quality is  assumed to change as  a result of the standard.



     As an  example, suppose the 1980 discounted present value of all

future benefits in industry i  and county j  is $1 million,  the 1972

(base year) value  added in  the  corresponding industry and  county is

$10 million,  and the  air quality change due to the  secondary standard

is 50 Mg/m  measured as a 24-hour average.  In this  case
         BVAij  =  (1)/(10)/(50)  =  0.002
Calculations are made  for  both  value added and value of shipments

since both are alternative measures  of economic activity,  and thus

alternative bases for extrapolation.
                                 10-19

-------
     As a result of the above calculations, six ratios are developed



for each 3-digit industry:  the minimum, maximum,  and  average values



of BVA^•, over all counties,  and the corresponding ratios for BVS- -.



The minimums and maximums are calculated, as well as the averages, in



order to assess  the sensitivity of  the estimates.








     The second step  in the extrapolation procedure was to assemble



data on the  value  added and value of shipments in each county for each



of the four  2-digit industries. Data for 1972 were used  in order to



provide consistent scaling with the ratios  above.   Note  that with the



use of the more aggregate 2-digit  industries, data  are  available for



more counties than in the basic analysis based on 3-digit industries.



Hence,  the industry extrapolation also  accomplishes some geographic



extrapolation of the basic analysis.








     Also collected for each county was the air quality data for S02



and TSP in 1978.   As in the basic analysis,  data for 1978 were used as



the  base year  in describing  the scenario  for  attainment  of the



secondary standard (see Section 7).







     The third step in the calculation was  to multiply the ratios by



the appropriate  measures  of economic value  and  air  quality change in



each county.  This leads to  six  county-by-county estimates of the



discounted  present value of benefits in  each  industry -- six



corresponding to the  six  different ratios.
                                 10-20

-------
     In the  two 2-digit  industries  where more  than one  3-digit



industry was available  as  the basis  for extrapolation (SlCs 20  and



34), a weighted average  of  the benefits for  each  3-digit industry  was



used  in estimating  the benefits for  the corresponding  2-digit



industry.  The weights used were value added or value of shipments,



depending on which ratio was under consideration.  In SIC 201,  air



pollution  effects were not statistically significant at the 10 percent



level (see Section 7).   Thus,  in SIC  20, a weighted average  of zero



and SIC 202 benefits was used.  In SIC 344, air  pollution effects were



occasionally  significant but not in  the final model  (nor at all in  SIC



346).  The calculation for SIC 34 is based  on  a  weighted average of



zero and SIC  344 benefits,  but  in intended  to  be primarily



illustrative.








Manufacturing Sector Estimated  Benefits







     When the  county-by-county benefits,  calculated as described



above,  are added  up,  the  national estimates  shown  in Tables 10-6



through 10-8 result.   Table  10-6 presents estimates  for the current 3-



hour SC>2 secondary standard.  Table 10-7 contains  estimates for  the



alternative 24-hour S02 secondary standard.   Estimates  for the current



24-hour TSP  secondary standard are  in Table  10-8.   In each table,



estimates are  shown  for  each of  the  six  ratios  — the  minimum,



maximum,  and average  ratio based on  value added,  and similarly  for



value of shipments.  All  estimates are 1980 discounted  present values,



in 1980 dollars,  using  a  10 percent discount rate.  Note  that  the
                                10-21

-------
  TABLE 10-6.   MANUFACTURING  SECTOR EXTRAPOLATION FOR CURRENT 3-HOUR
               SECONDARY  S02  STANDARD*  (discounted present values
               for 1980 in million of 1980 dollars)**


                          Basis  for extrapolation

  SIC           Value added                  Value of shipments
        Minimum   Average    Maximum      Minimum   Average   Maximum
         ratio     ratio     ratio        ratio     ratio     ratio
   20     7.3      11.1       25.6          6.1       6.4       6.7

   26     —        —       —           _____



   35     _____           —
 * Current S0  secondary standard is 1,300 Mg/m  ,  based on a 3-hour
   averaging  time.   Standard not  to  be  exceeded more  than once per
   year.

** Discount rate of  10  percent  is assumed.

— Equals zero.
                                  10-22

-------
   TABLE 10-7.  MANUFACTURING SECTOR EXTRAPOLATION FOR ALTERNATIVE
                24-HOUR SECONDARY S02 STANDARD*  (discounted  present
                values for 1980 in million of  1980 dollars)**
                           Basis for extrapolation
SIC
20
26
34
35
Value added
Minimum
ratio
1,860
307
—
__
Average
ratio
2,820
343
—
j
Maximum
ratio
6,537
393
—
__
Value of shipments
Minimum
ratio
1,479
314
—
_i
Average
ratio
1,558
354
—
_UL 	
Max imum
ratio
1,622
393
—
w_
 * Alternate S02 secondary standard  is  260  Mg/m ,  based on a  24-hour
   averaging  time.   Standard  not to be exceeded more than once per
   year.

** Discount rate of  10 percent  is assumed.

— Equals zero.
                                  10-23

-------
 TABLE 10-8.  MANUFACTURING SECTOR EXTRAPOLATION FOR CURRENT 24-HOUR
             SECONDARY TSP STANDARD* (discounted present values  for
             1980 in million of 1980 dollars)**


                         Basis for extrapolation
SIC
20
26
34+

Minimum
ratio
—
—
6,511
35 2,707
———=—=— ==——=——— =
Value added
Average
ratio
—
—
10,148
6,788
____________

Maximum
ratio
—
—
19,051
10,253
_______——__—
Value
Minimum
ratio
—
—
7,156
3,539
of shipments
Average
ratio
. —
—
9,307
8,029
Maximum
ratio
—
—
11,495
11,798
= — — —— — — • — — S— ==
 * Current TSP secondary standard is 150 ug/m , based on a 24-hour
   averaging time.  Standard not to be exceeded more than once per
   year.

** Discount rate of 10 percent is assumed.

 + Illustrative calculations based on SIC 344 benefits.

— Equals  zero.
estimates  are  inclusive of  the benefits for  the six  3-digit

industries.



     As shown in  Table  10-6,  benefits for  the  current 3-hour SO-

secondary standard are predicted to arise  in only one industry, SIC

20, and be very small.  This is because so  few counties are out of

compliance with this standard.  It is for this same reason that no

benefits are predicted  to arise in SIC 26.  For SICs 34 and 35 the
                                10-24

-------
effect of S02 was not found to be statistically significant in the



basic analysis (for SICs 344,  346, and 354) and thus no benefits are



estimated.







     In Table 10-7, estimated benefits for the alternative 24-hour S02



standard are  presented.  In this  case, because many more counties are



out of compliance, benefits are considerably larger.







     Estimated benefits for the current 24-hour TSP standard are shown



in Table 10-8.   In SICs  20 and 26, the effect of  TSP was not found to



be statistically significant in the basic analysis (for  SICs 201, 202,



and  265).   Hence  no  benefits  arise in  these  industries.   Large



benefits are estimated  for SIC 34 and SIC 35, however.  Recall that



these  are  1980 discounted present  values  over an infinite  time



horizon.  For comparison purposes, the discounted present values of



future  shipments  in  these  two  industries  are estimated  to  be



approximately  $1  trillion and $1.3 trillion, respectively.  Thus,



benefits  are approximately  0.9 percent  and 0.6 percent of  value



shipped, respectively, when estimated using  the "average" ratio for



value of shipments.







     The geographic distribution of estimated benefits is shown in



Table 10-9.  Entries are  included for those industries,  pollutants and



standards  with non-zero  benefits.  Estimates  are  shown  for  the



extrapolation based on  the  "average" ratio for value of  shipments.
                                10-25

-------
      TABLE 10-9.
GEOGRAPHIC DISTRIBUTION OF EXTRAPOLATED BENEFITS
FOR THE MANUFACTURING SECTOR (discounted present
values for 1980 in millions of 1980 dollars)*
Current 3-houi
S02 standard
SIC
20
New England —
Mid-Atlantic —
East North Central 6
West North Central
South Atlantic —
East South Central
West South Central
Mountain —
Pacific
U.S. totals 6
—————«—————«••—»———————-
: Alternate
S02 star
SIC
20
5
497
808
67
15
134
—
33
—
1,558
:============:
-— =— — — — — — — __________
2 4 -hour Current 't
idard TSP star
SIC SIC
26 34**
75 417
134 1,359
134 4,654
10 475
144
304
— 452
162
1,341
354 9,307
==========:=========:=
> 4 -hour
idard
SIC
35
20
970
3,755
367
15
163
120
659
1,959
8,029
 * Using a discount  rate  of  10  percent and the "average" ratio for value
   of shipments.  Details  may not add to totals due to independent round-
   off errors.

** Illustrative calculations based on SIC 344 benefits.

— Equals zero.
                                   10-26

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ELECTRIC UTILITY SECTOR EXTRAPOLATIONS



Overview



     The basic analysis  for the electric utility sector  (see  Section

8) was concerned with the effects of air pollution (e.g., corrosion)

on the maintenance and operating  costs  for privately-owned, fossil

fuel-fired,  steam-electric  generating plants.   Not  considered  in that

analysis were the effects on other types of  generating plants, or on

transmission and distribution systems.  These other  effects  are

considered in this section.



Other Types  of Power Plants



     The basic analysis found that fossil steam-electric  power plants

in polluted  areas  experience higher  maintenance costs than power

plants  in cleaner areas,  after statistically controlling for other

sources  of  cost variation.  This effect was associated with  S02

pollution but not TSP.



     Based on the above finding, the benefits  of attaining compliance

with the alternative  24-hour S02 secondary standard  were estimated.*

Benefits  totaling  $55.8  million,  in  the form  of cost  savings  for

fossil steam-electric plants,  were  identified in  22 counties.  This
  No benefits were  found  for the  current  3-hour S02  secondary
  standard.
                                 10-27

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figure is the 1980 discounted present value of all  future benefits, at



a 10 percent discount rate.








     In  the  above  counties,  fossil  steam-electric  power  plants



accounted for 79  percent of the installed generating  capacity.  Within



these  counties  there were  also gas  turbine,  hydroelectric,  and



gas/steam turbine plants.  A detailed  analysis of the maintenance



costs of these other plants  was  not undertaken, in view of the fact



that the additional  benefits  to these plants  were  likely to  be  small.



Instead, the  following rough  calculation was made.








     If we  assume  that  the  total  benefits  in  these counties  are



proportional  to installed  capacity (i.e.,  benefits  to other generating



plants  are  comparable to those  for fossil  steam plants),  then the



additional benefits  to the other plants can be calculated as







          55.8/0.8 - 55.8  =  $14.0 million.







Note that this is based  on a  rather  strong  assumption, but in view of



the small magnitude, a more specific analysis did not seem warranted.








Transmission and  Distribution Systems








     As noted in  Sections 2 and 8, data limitations make  a statistical



analysis of  air pollution effects on transmission  and  distribution



systems difficult.   Individual system components, such  as transmission
                                  10-28

-------
towers, can and have been  studied statistically (see Section 8 for

references).  However, the overall systems are for the most part so

geographically  dispersed  that the appropriate  matching  with air

quality data is not well-defined.



     As an alternative basis  for estimating benefits,  an updated

version of the approach and data developed by Perl (3) was  used.  The

approach involves the following steps:
       i)    Estimate the  inventory for  key elements of  the
            transmission and distribution system in some base
            year.

      ii)    Adjust  the  baseline inventory to account for  growth
            after the base year.

     iii)    Allocate the adjusted  inventory among counties based
            on the  distribution of population.

      iv)    Estimate  the  additional  unit  maintenance cost as  a
            function of air pollution conditions.

       v)    Calculate benefits as the  savings in maintenance
            cost in each  county, based on  the change  in  air
            quality as a  result  of achieving  the  secondary
            standard.
Each of  these  steps is described below.



Baseline Inventory—

     Among the items  considered in the study by Perl were three of

interest for the electric utility sector analysis.  These included:

(1)  externally mounted power transformers, (2) galvanized  steel power

line transmission towers,  and  (3)  pole  line  hardware.  Note that the
                                 10-29

-------
latter  are also  used  jointly by  the  telephone utilities so  an

adjustment for this fact is made later  in the analysis.  Note  also

that some electricity customers may own substation  equipment, and thus

external power transformers.   However,  utility ownership  is  far  more

common,  so  the  possibility of customer ownership is neglected in the

analysis.



     The baseline  inventory for the above  items in 1970 were estimated

by Fink et al.  (4) to have been as follows:
     •    Transformers — 556.63 •  106  ft2

     •    Towers — 194,000 towers  •  2,500  ft2/tower
                                          =  485  • 10b ft2

     •    Hardware — 3.04 • 106 tons •  450 ft2/ton
                                          =  1,368 • 106 ft2
Growth Adjusted  Inventory—

     In the Perl  study,  benefits were  calculated for 1978  and  the

growth in inventory  between 1970 and 1978 was assumed  to be at  the

same  rate as the growth  in GNP.  In this study, an estimate for 1985

is required,  and the  inventory growth is taken to  be  at the same rate

as the growth in installed electric  generating capacity as forecasted

by the Department of  Energy  (5).   The  latter should  be a  better

indicator  of the  requirements  for transmission and distribution

facilities.   This assumption leads to adjusted inventory estimates (in

ft2) of 1,120 •  106, 976 • 106,  and 2,752  • 106, respectively.
                                  10-30

-------
Geographic Allocation—


     As in  the Perl  study,  we  assumed  that  the inventory was


distributed in the same manner as the population distribution.  The


population distribution by county in 1975  was used, as reported in the


County and City Data Book (1).





Incremental Maintenance Cost—


     As in the Perl study, estimates  of  the additional maintenance


cost due  to pollution  were taken  from  Fink  e_t al.  (4).  In  1970


dollars, these were
                                       2
          Transformers — $0.0167 per ft  per  year.

                                       2
          Towers       — $0.0233 per ft  per  year.


          Hardware     — $1.20 per pole per year/4 ft^ per pole

                                      =  $0.30  per ft2 per year.
Since poles  are  often jointly used by  both telephone and  electric


utilities,  we assume  that half of the pole line hardware maintenance


cost is  incurred  by each, thus yielding $0.15 per ft  per year.   To be


consistent  with other parts of this study, the above costs were then


adjusted to 1980  dollars using the implicit price deflator for GNP.





     The estimates  above represent the difference in maintenance cost


between "clean"  and  "polluted" environments,  neither of which  was


defined  in  the original study by Fink.   Perl converted the estimates


to cost  per unit  of SO^  pollution.  In this  study,  the conversion is


made  to costs per unit of  SC>2 pollution.   As  the  definition of
                                 10-31

-------
"polluted",  we used the population weighted average SC>2 concentration


in all of  the  counties which exceeded the primary 24-hour SC^ standard


in 1978.  The weighted average was 555.64 Mg/m  .  As the definition


for "clean", we  used  the  alternative 24-hour S02 secondary standard of


260
     Incorporating  all  of  the  above adjustments leads to the following


estimates of incremental unit  maintenance costs for electric utilities


in 1980 dollars (expressed  in  mills):
                                       9                  o
     •    Transformers  —  0.10966 per ft  per year per /*g/nr.


                                       2                  ?
     •    Towers        —  0.15299 per ft  per year per /*g/nr.

                                       9                  -
     •    Hardware      —  0.98498 per ft  per year per
Estimated Benefits—


     Using the above  information,  and actual  air quality data for the


individual counties/  an estimate of benefits  was calculated.   For the


24-hour equivalent of  the current  3-hour  SCu  secondary  standard,  the


estimated benefits  were $0.057 million, all  in  one county  in the


Mountain  Census Division.   For  the alternative  24-hour  SO2 secondary


standard, the estimated benefits were $54.2 million.   Both  of these


estimates are  the  1980  discounted present  values of all  future


savings,  in  1980 dollars, using a 10 percent discount  rate and the


attainment scenario described  in earlier sections.
                                  10-32

-------
     The above  figures  are "conservative estimates because they assume

no additional growth  in  the inventory after  1985.   If,  instead, the

inventory  is  assumed to continue to  grow  at the post-1985 forecasted

rate of growth  in installed generating capacity reported in Reference

(5),  benefits for the  alternative 24-hour standard  would be about 40

to 50 percent higher.



     The geographic  distribution  of benefits is shown  in Table  10-10.

As in the  other sectors,  benefits for SC^  are heavily concentrated in

the Mid-Atlantic  and East North Central Divisions.  This  reflects both

the distribution  of air pollution and population.
TABLE 10-10.  ESTIMATED BENEFITS TO ELECTRIC UTILITY TRANSMISSION AND
              DISTRIBUTION SYSTEMS FROM ATTAINMENT OF THE ALTERNATIVE
              24-HOUR SO2 SECONDARY STANDARD* (discounted present
              values for 1980 in millions of 1980 dollars)**
  New England

  Mid-Atlantic

  East North Central

  West North Central

  South Atlantic
 1.4

15.0

23.4

 2.2

 7.0
East South Central

West South Central

Mountain

Pacific

U.S. total
 0.4
 4.9
54.2
 * Alternative S02 secondary standard is 260 /*g/m , based on a 24-hour
   averaging time.  Standard not to be exceeded more  than once per
   year.

** Discount rate of 10 percent is assumed.

— Equals zero.
                                   10-33

-------
SUMMARY OF EXTRAPOLATIONS "







     The purpose of this section  has been  to expand  the  coverage of



the basic analysis.   The basic analysis  considered  only  four sectors



— households,  agriculture,  manufacturing,  and  electric  utilities —



and provided  only partial coverage  of those  sectors.   In this section,



the coverage  was broadened by making limited extrapolations within the



sectors included in the basic analysis.








     In the household  sector, the basic analysis covered  24 major



metropolitan areas.   The extrapolations extended these results to



other areas of  the country.








     In the manufacturing sector,  the  basic  analysis included six



industries representing  8  percent of  the  manufacturing  sector.



Extrapolations  were made to  closely related  industries, thus extending



coverage to about 32 percent of the sector.







     The electric utility sector basic analysis  considered the effects



on fossil steam-electric generation.  These results were  extended to



other  forms  of generation.  Additional data  and procedures  led to



estimates for  the  transmission  and  distribution  phases of  the



industry.







     For  reasons  described  in Section  9, no  extrapolations  were



developed for the agricultural sector.
                                  10-34

-------
     A summary  of the  results for  the basic analysis and  the

extrapolations is provided  in Tables 10-11 through 10-13.  Table 10-11

includes benefits estimates for the  24-hour equivalent of the current

3-hour secondary S02 standard.   Table 10-12  presents benefits  for an

alternative 24-hour secondary  S02 standard.   Table 10-13 provides the

estimated benefits for  the  current 24-hour secondary  TSP  standard.
TABLE 10-11.   ESTIMATED BENEFITS IN SECTORS ANALYZED  FOR CURRENT SOo
              SECONDARY STANDARD* (discounted present values  for 1980
              in millions of 1980 dollars)**
                               Basic            Basic analysis
          Sector             analysis*        with extrapolation
    Households                  —                    4.6

    Agricultural                 0.2                   0.2

    Manufacturing                —                    6.4

    Electric Utilities           —                    0.1

 * Current secondary standard for S02 is 1,300 Mg/m  , based on a 3-
   hour averaging time.  Standard not to be exceeded more than once
   per year.

** Discount rate  of  10 percent is assumed.

 + Estimates  shown  are for  effects which were  statistically
   significant at the 10 percent  level or less.  Estimates would be
   larger if  higher  significance levels are used.

— Equals zero.
                                 10-35

-------
 TABLE  10-12.  ESTIMATED BENEFITS IN SECTORS ANALYZED FOR ALTERNATIVE
              S02 SECONDARY  STANDARD* (discounted present values for
              1980 in millions of 1980 dollars)**
Sector
Household
Agricultural
Manufacturing
Electric utilities
Basic
analysis+
733
22
345
56
Basic analysis
with extrapolations
1,140
22
1,912
124
 * Alternate secondary  standard is 260  A<-g/m ,  based on  a  24-hour
   averaging time.  Standard not to be exceeded more  than once per
   year.

** Discount  rate of 10 percent is assumed.

 + Estimates shown are  for  effects which were statistically
   significant at the 10 percent level or less.  Estimates would be
   larger  if higher significance levels are used.
                                 10-36

-------
 TABLE 10-13.  ESTIMATED BENEFITS IN  SECTORS ANALYZED FOR CURRENT TSP
              SECONDARY STANDARD* (discounted present values  for
              1980 in millions of 1980 dollars)**
                              Basic            Basic analysis
          Sector              analysis*       with extrapolations
    Household                   1,144                2,930

    Agricultural                  —                   —

    Manufacturing               4,117               15,870

    Electric utilities            —                   —

 * Current TSP secondary standard is  150  Mg/m ,  based on a 24-hour
   averaging time.  Standard not  to be  exceeded  more than once per
   year.
**
   Discount rate of 10 percent is  assumed.
 + Estimates shown are  for effects  which  were  statistically
   significant at the 10 percent level or less.  Estimates would be
   larger  if higher significance  levels are used.

— Equals  zero.
                                 10-37

-------
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                                 10-38

-------
 SECTION 11




BIBLIOGRAPHY

-------
                       BIBLIOGRAPHY — PART A

                      ECONOMIC THEORY AND DATA
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-------
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-------
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-------
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